Intel cpus: use CPU_PHYSMASK_HI define in CAR

Intel cpus: use CPU_PHYSMASK_HI define in CAR

Unifies models 6ex, 6fx and 106cx.

Change-Id: I2bb632c7148a7d937f24eb559f7f4e539d227470
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/638
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>